Figure 9 - Gastroesophageal reflux detected by combined multichannel intraluminal impedance and pH (MII-pH) monitoring.
From the following article
Gastroesophageal reflux monitoring: pH and impedance
Radu Tutuian and Donald O. Castell
GI Motility online (2006)
doi:10.1038/gimo31
Impedance-detected reflux episodes during which the intraesophageal pH drops from above to below 4.0 are considered acid (a), whereas impedance-detected reflux episodes during which the intraesophageal pH remains above 4.0 are considered nonacid (b).
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